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my backup server is running btrfs (kernel wiki) with raid1 (mirror), but i’m running out of space and don’t want to upgrade. And raid1 isn’t even necessary, it is the backup after all. To free up some space, well half of it, i used this command:
btrfs balance start -dconvert=single / you can live migrate between ‘profiles’, for example from ‘single’ (data is saved only once on the btrfs filesyste), to raid1

Sometimes you raspberry pi (or other boards: arduino, olimex) has no Internet access but you want to keep time between reboots. A rtc (real time clock) will do the job.
First, get one! They can be found on popular sites and ebay. The DS3231 is a bit more accurate than the other rtc’s but they all will do the job. adafruit ebay ebay2 olimex when you have an rtc module you have to connect with you raspberry.